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A067276 as a simple table

na(n)
12
2-1
3-78
4880
5-4656
6-14304
7-423936
88342720
9711956736
10-615707136
1121057138688
12-4663930678272
13211912980656128
14-9178450735677440
1540005919124799488
1683013253447139328
17-8525111273818357760
18-800258888289188708352
19-15170733077495639179264

[2,-1,-78,880,-4656,-14304,-423936,8342720,
 711956736,-615707136,21057138688,-4663930678272,
 211912980656128,-9178450735677440,
 40005919124799488,83013253447139328,
 -8525111273818357760,-800258888289188708352,
 -15170733077495639179264]